Perhaps you should try some spelling variations:
manh nhanh » danh nhan, anh nhan, danh thanh
thu sach » tu sach, thuat sach, thuoc sach
duc manh » suc manh, duc anh, duc minh
hai cau » hai chau, hai hau, hoi cau
hai chu » hai chau, hoi chu, hai chi
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. hieu ((ve cam) OR (ve cac)) duc manh nhanh ((hai cau) or (hai chu)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu ((ve cam) OR (ve cac)) duc manh nhanh ((hai cau) OR (hai chu)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu ((ve cam) OR (ve cac)) duc manh nhanh ((hai cau) or (hai chu)) tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ((ve cam) OR (ve cac)) duc manh nhanh ((hai cau) or (hai chu)) tren*.